It is possible your camera / device has auto gain or AGC turned on. Make sure you turn off this feature when using the V-Mic D3 Pro. AGC will fight against the gain knob and cancel out any adjustments you make.
Deity Microphones is committed to making unique microphones and products that get the job done. Launched by a TV location sound mixer, Deity Microphone’s roots are planted in knowing what kind of equipment working professionals need in their kit.